condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0684505 0.0684505 0.0684505 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.425744 0.425744 0.425744